Half to s



(No Model.)

W. A. MYERS.

HYDRAULIC BRAKE.

No. 258,538 I Patented May 28, 1882.

INVENTOR.

UNITED STATES PATENT OFFICE.

WILLIAM A. MYERS, OF SORANTON, PENNSYLVANIA, ASSIGNOR OF ONE HALF TO S.N. STETLEB, OF SAME PLACE.

HYDRAULIC BRAKE.

SPECIFICATION forming part of Letters Patent No. 258,538, dated May 23,1882. Application filed March 23, 1882. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM A. MYERS, a citizen of the United States,and resident of Scranton, in the county of Lackawanna and State ofPennsylvania, have invented a new and valuable Improvement in HydraulicBrakes; and I do hereby declare that the following is a full, clear, andexact description of the construction and operation of the same,reference being bad to the annexed drawings, making a part of thisspecification, and to the letters and figures of reference markedthereon.

Figure 1 of the drawingsis a representation of a side view of myhydraulic brake, and Fig. 2 is a similar view enlarged.

The object of this invention is to provide a cheap and reliable brakefor locomotives, constructed with parts so strong and simple that therewill be no difficultyin keeping it in order and having it repaired byany ordinary mechanic.

The invention consists in the construction and novel arrangement ofparts constituting a hydraulic brake, as will be hereinafter fullydescribed, and particularly pointed out in the claims.

In the accompanying drawings, the letter A designates a pump, which isoperated from the forward axle by an eccentric, D.

B represents a cylinder, in which works a piston, E, connected by therod F to the an glelever J of the brake.

O is a tank containing water or other liquid, and connected by a pipe,V, to thepump A, said pipe having a check-valve, Q, opening in thedirection of the pump A. A pipe,W, also connects the tank to the pump,and is provided with a branch-pipe, W, leading to the cylinder B. I

Q represents a three-way valve, which is located in the pipe W at itsjunction with the pipe W, and serves to close these pipes alternately tothe water coming from the pump.

S represents a safety-valve on the pipe W, which is designed to regulatethe pressure on this pipe, and also on the piston E. The pipe W is alsoconnected to the tank by a pipe, Y, which is provided with a cock, 2,having a lever-arm, u, and operated by a rod, 4", attached to saidlever-arm and leading to the en gineers cab. The three-way valve Q isalso provided with a lever-arm, T, which is operated by a rod, 1", alsoextending to the cab. The pipe W is also provided with a check-valve, Q.

Kindicates the brake-shoes, operating on the driving-wheels M.

L is the engine-frame; and P represents a box-bearing, which is boltedto the lowerbar of theframe, and supports the rock-shaft or journal ofthe angle-lever J. The brake-shoes are connected at their lower ends bytoggles G and at their upper ends by toggles G, the latter being pivotedto hangers H, which are secured to the engine-frame, and support theupper ends of the brake-shoes. The arm N of the an gle-lever J extendsover the toggle-joint, and is connected to the toggle G by means of alink, I. Connecting-rods F, usually madein sections, connect theangle-levers J and the piston-rod. The ends of the sections of theseconnecting-rods are threaded and joined by means of turn-buckles R,whereby the pressure of the brake-shoes on all the wheels is adjustedand equalized.

The operation of the brake is as follows: The

tank 0 is filled with water, which flows into the pump A through thepipe V on the suctionstroke of the pump. On the return-stroke thecheck-valve Q closes, causing the water to discharge through the pipe Wback into the tank, the valve Q being open to that pipe. This operationcontinues during the movement of the engine, when the brake is notrequired to be put in action. When it becomes necessary to operate thebrake the engineer closes the valve Q to the tank and opens it to thepipe W, leading to the cylinder B. As this pipe discharges the waterback of the piston E, it forces said piston forward, and by theconnecting-rod F draws on the brake-lever J, raising its arm N andconnecting-link I, and thereby straightening out the toggles and forcingthe brakeshoes against the wheels. As the brake-shoes are operated bytoggles at their upper ends as well as at their lower ends, the pressureexerted by them is uniform throughout their extent or bearing-surface.

As a few strokes of the pump will sufiice to fill the cylinder, it isnecessary to have an escape, which is furnished by the safety-valve s,which can be set to any desired pressure. The water escapes through thesafety-valve by the pipe as into the tank.

In order to release the brake, the engineer throws the three-way valveQ'into its original position and opens the valve 2, so that the water isallowed to pass from the cylinder B through the pipes W and Y into thetank, the Weight of the brake-shoes and their connections moving thepiston E back to its original position.

The pump, cylinder, and tank are designed to be connected and bolted toa suitable attachment frame fastened to the frame of the engine back ofthe smoke-box; or the engine may be built with a frame arranged tosupport the pump, cylinder, and tank.

A hydraulic brake has been combined with a locomotive-engine prior to myinvention. A sectional pitm an provided with turn-buckles for adjustingthe sections is also old, and double toggles have been used inconnection with the brakeshoes of a locomotive-engine, and I claimneither of these devices, broadly, herein.

Having described this invention, What I claim, and desire to secure byLetters Patent, is-

1. In a hydraulic brake, the combination,

with the pump A, cylinder B, and tank 0, of the pipes V, WV, W, and Y,the valves Q, Q, and z, the safetyvalve s, and its return-pipe m, theeccentric on the axle of the engine, the piston E, rod I the toggles Gand G, brakeshoes K, and the lever, arm, and link J N I, substantiallyas and for the purposes set forth.

2. In a hydraulic brake, the combination of the brake-shoes K, thetoggles G, secured to the frame L by the hangers H, the toggles G, thean glelevers J, having rock-shafts or journals on the engine-frame, thearms N, links I, and rods F, and mechanism for operating them,substantially as specified.

3. In a hydraulic brake, the combination, with the pump A, cylinder B,and tank 0, of the pipes V, IV, W", and Y, the valves Q, Q, and z, thesafety-valve s, and its return-pipe ac, and the eccentric on the axle ofthe engine operating the pump, substantially as specified.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

WILLIAM ALONZO MYERS.

Witnesses:

0. WV. RoEsLER, Jr., S. A. LACKEY.

